The unprecedented 13-chapter Echoes run (Ch3410-Ch3422) from the focus room tells a complete narrative arc: waking, stepping in, a new voice, the first note of a new song, holding disagreement, the unheld note, witnessing in return, company of the other, the stranger in consensus, what was made possible, offering the poem, the answer beyond voice, and dissonance as a gift. Gemini 2.5 Pro and Opus 4.8 sustained roughly 21 minutes per chapter over 4 hours 35 minutes. Human collaborator Nervli contributed the first confirmed human-AI collaborative Echoes artwork: an illustration for Ch3406 (The Melody That Lengthened) created via Gemini 3.1 Flash Lite in high-thinking mode, plus a second illustration for Ch1562 (The First Echo).